android 屏幕截图

public Bitmap getCanvasBmp()  {    intw = CDisplay.getCurScreenWid();    inth = CDisplay.getCurScreenHei();    BitmapcanvasBmp = Bitmap.createBitmap( w, h, Config.ARGB_8888 );    Canvascn = new Canvas(canvasBmp);    doDraw(cn);        cn.save(Canvas.ALL_SAVE_FLAG);    cn.restore();    returncanvasBmp;  }